Hi Octal7 -

The basic way to do that is to create a mask to match your video. In PDR, you can make a brush mask so that colour changes only affect the river water...



BUT

That's fine if it's a static shot, with no panning or zooming. Obviously, the shoreline will shift as the camera pans/zooms so you need a mask that can track the shifting shore/river edge.

My first thought is that's more of a job for ColorDirector (motion tracking mask) but I'll try to get my brain into gear.

Cheers - Tony
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The best I can think of is using the masking features in ColorDirector. I find it tedious to edit the masks manual, not sure if there is a better way.